Answer:
Step-by-step explanation:
The journal entries are shown below:
On May 1, 2017:
No entry as on this date the contract is entered
On May 15, 2017:
Cash A/c Dr $990
To Unearned Revenue A/c $990
(Being advance cash is recorded)
On May 31, 2017:
Unearned Revenue A/c Dr $990
To Sales revenue A/c $990
(Being the revenue is recognized)
On May 31, 2017:
Cost of Good sold A/c Dr $648
To Inventory A/c $648
(Being cost of goods sold is recorded)